
226 
which are scarcely more than incisions, crossing the coste, but~ 
less valid there than in the intervening furrows. In the first 
three whorls, just below the suture (the distance increasing 
gradually in successive whorls) a well-marked transverse furrow 
cuts off a row of subsutural nodules from the cost; in the fourth 
whorl this is less marked, and the other spiral furrows become 
nearly equal to it, gradually diminishing in depth towards the 
centre of the whorl. Last whorl subconvex, convexity varying 
slightly in different specimens, contracted just below the peri- 
phery. Longitudinal plicee numerous, close-set, irregular in size 
and distance, degenerating into marked incremental strive towards 
the aperture. Spiral incisions well marked below the suture to 
the middle of the whorl, obsolete in front of this, though still 
visible under the lens; five or six valid spiral furrows over the 
contracted part behind the notch. Aperture obiiquely elongately 
oval. Outer lip nearly straight in the upper two-thirds, then 
bent to the left at an angle of 135°; simple, acute. Columella 
straight for one-half its extent, then slightly bent to the left; 
plicee four, sometimes the last forms the margin of the canal, some- 
times is distinctly above it, equidistant, well marked, sometimes 
ceasing at the margin of the callus of the inner lip, which is sharply 
defined and at the lower part free, so as to form a minute rimate 
perforation with the varix of the notch. Canal wide, short, scarcely 
reflected, distinctly notched. Ornament, color greyish-white, a 
broad indistinct pinkish-brown subsutural band, maculated at 
intervals with deeper brown patches ; in some examples only these 
are visible. On the body-whorl three indistinct fine bands either 
continuous or composed of brown dots, the highest of which 
appears on the spire-whorls, the lowest may be continuous over 
the anterior part of the shell from a little above the columellar 
plice. When dead, the shell is nearly pure white with a pinkish 
tip, and faint brownish maculations. 
Length, 11:20 mm.; breadth, 3:5, or 10mm. and 3:75; length 
of aperture, 4-5 mm.; width, 1 mm. 
_ Diagnosis.—lt resembles M. Tasmanica, Ten.-Woods. (lent to 
me by Mr. May, of Hobart), in the ribbing and transverse gird- 
ling, but the shape is different. The latter is ovate and attenuate 
at both ends, with these dimensions: 11 mm. long., 5 mm. broad; 
length of aperture, 6 mm. fully. It is brown, with two or three 
yellowish-white bands—mine is greyish-white, with brown bands, 
but this distinction may simply be a question of width of bands, 
in which circumstance mine vary widely. 
Habitat.—St. Vincent Gulf, 17 fathoms, six dead; off New- 
land Head, 20 fathoms, nine dead ( Verco). 
Types in my cabinet. 


